Also at Bahnhofstrasse 25 were
- Selma Wienskowitz geb. Karliner, born 08/03/1879, who I speculate is Frieda's sister; a death certificate on ancestry.com shows that Selma was the widow of Hugo Wienskowitz (07/05/1873 - 25/05/1940);
- Oskar Wienskowitz born 24/04/1858 and
- Fanny Wienskowitz geb. Lewy born 28/11/1865.

Oskar and Fanny's cards show the same three addresses from 1915 to 1942, so I assume they were husband and wife.